US20110222700A1 - Adaptive active noise cancellation system - Google Patents
Adaptive active noise cancellation system Download PDFInfo
- Publication number
- US20110222700A1 US20110222700A1 US13/046,358 US201113046358A US2011222700A1 US 20110222700 A1 US20110222700 A1 US 20110222700A1 US 201113046358 A US201113046358 A US 201113046358A US 2011222700 A1 US2011222700 A1 US 2011222700A1
- Authority
- US
- United States
- Prior art keywords
- profile
- cancelation
- noise
- predefined
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17825—Error signals
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3016—Control strategies, e.g. energy minimization or intensity measurements
Definitions
- Signals propagating through electrical systems may include desirable signal components and undesirable signal components.
- An undesirable component may be generated outside of an electrical system or generated by the electrical system itself. In an acoustic system, one such undesirable component is ambient acoustic noise.
- Circuits are often incorporated into an acoustic system to actively cancel certain types of expected ambient acoustic noise. However, the actual ambient acoustic noise may be quite different than the expected ambient acoustic noise.
- FIG. 1 illustrates an exemplary system for processing signals within an electrical system.
- FIG. 2 illustrates a first representative exemplary system for processing signals within an electrical system.
- FIG. 3 illustrates an exemplary system model for a headphone with feedback.
- FIG. 4 illustrates a second representative exemplary system for processing signals within an electrical system.
- FIG. 5 illustrates a third representative exemplary system for processing signals within an electrical system.
- FIG. 6 illustrates an exemplary process that may be implemented to identify ambient acoustic noise and adjust programmable circuits to cancel the noise at least in part.
- An exemplary acoustic system is an acoustic headphone in which it may be beneficial to cancel acoustic noise present in the ambient environment.
- Some headphones are tuned at manufacture to cancel noise in certain frequency bands. For example, some headphones are tuned to cancel airplane engine noise that appears predominantly in the frequency band 200-300 Hertz (Hz). When such headphones are worn in an airplane the engine noise predominant in the ambient acoustic noise that penetrates the headphone ear cup is canceled within the headphone. When such headphones are worn elsewhere, the frequency band 200-300 Hz will still be canceled, but ambient acoustic noise at other frequencies may not be and the wearer of the headphone may hear ambient acoustic noise that penetrates the headphone ear cup.
- Hz Hertz
- Some headphones include a mechanism by which the wearer of the headphone may switch between generally two or three different cancelation options.
- the wearer may switch between airplane, car, and train noise cancelation options.
- the wearer of such a headphone does not have the ability to cancel other ambient noise such as the noise of jackhammers, the noise of crying babies, and the noise of squeaky machinery, to name just a few.
- the wearer of the headphone would only have the ability to try the different available cancelation options.
- the number of options provided may be limited by the size of the switching mechanism or by perceived complexity of use.
- a headphone as described below dynamically analyses the ambient acoustic noise and adaptively configures the headphone to cancel noise in at least a dominant frequency band of the noise.
- Analysis of noise may include determining the frequency band of the dominant potion of the noise.
- Analysis of noise may alternatively or additionally include profiling the energy of the noise by determining the energy of the noise at different frequencies or within different frequency bands.
- Cancelation may be performed passively or actively.
- passive cancelation only acoustical noise cancellation is used.
- active cancelation an anti-noise signal is generated and combined with the electrical signal applied to the speaker within the headphone, or an anti-noise acoustic signal is produced through a secondary speaker within the headphone.
- Anti-noise is a signal equal in magnitude and opposite in phase to the noise to be canceled.
- the use of anti-noise is sometimes referred to as active noise cancellation.
- Active noise cancellation may include some combination of feedback and feed forward signal processing.
- headphone may represent one headphone in a pair of headphones, one headphone in a headset with a single headphone, an earbud, an auditory aid, or any other acoustic device for transmitting audio signals from an input to a speaker. Further, the concepts described herein for headphones apply to other acoustic systems as well.
- FIG. 1 illustrates an exemplary system 100 for adaptively canceling undesirable ambient noise.
- System 100 may include a noise detector 120 , a noise energy profiler 125 , a cancelation profile generator 130 , and a cancelation profile effector 135 .
- the various elements of system 100 shown in FIG. 1 are presented as illustrative and not limiting.
- FIG. 1 may include more or fewer elements than shown as appropriate for a particular implementation.
- Noise detector 120 may be any of or a combination of hardware, software, and firmware that performs the function of identifying noise in a system.
- Information regarding the identified noise is provided to the noise energy profiler 125 .
- information may include an analog or digital representation of the identified noise.
- Noise energy profiler 125 may be any of or a combination of hardware, software, and firmware that performs the function of profiling the energy in the noise.
- Noise energy profiler 125 uses the information from noise detector 120 to create a profile of the noise.
- the noise energy profile may include average amplitude of the noise for multiple frequencies or frequency bands.
- the noise energy profile may identify a frequency band of the noise that contains the most energy.
- Noise energy profiler 125 may provide the profile to cancelation profile generator 130 .
- Cancelation profile generator 130 may be any of or a combination of hardware, software, and firmware that performs the function of generating a profile for canceling noise.
- cancelation profile generator 130 generates a profile that represents a desired transfer function for system 100 inherently including noise cancelation. In other implementations, cancelation profile generator 130 generates a profile that represents a desired anti-noise signal.
- a noise cancelation profile may be as simple as a single amplification factor.
- a noise cancelation profile may be a complex set of equations, or may include, for example, a matrix or other set of frequency, amplitude, and phase information describing an anti-noise signal or a desired frequency response.
- a profile may further be an indicator of a selection of a stored profile.
- Cancelation profile effector 135 may be any of or a combination of hardware, software, and firmware that performs the function of applying the anti-noise profile within the electrical system.
- the implementation of effector 135 is dependent on the architecture of system 100 and the form of the generated anti-noise profile. Thus, specific implementations of effector 135 are described in detail below with respect the associated exemplary implementations of cancelation profile generator 130 .
- Noise detector 120 , noise energy profiler 125 , cancelation profile generator 130 , and cancelation profile effector 135 may be included in one or more computing devices.
- Examples of computing devices include, without limitation, a computer workstation, a server, a desktop, notebook, laptop, or handheld computer, a smart phone, a headphone, a device with an embedded processor, or some other known computing system or device.
- Computing devices generally include computer-executable instructions.
- a computing device receives instructions, e.g., from a memory, a computer-readable medium, etc., and executes these instructions, thereby performing one or more processes.
- Such instructions and other data may be stored and transmitted using a variety of known computer-readable media.
- a computer-readable medium includes any non-transitory (e.g., tangible) medium that participates in providing data (e.g., instructions) that may be read by a computer (e.g., by a processor of a computer). Such a medium may take many forms, including, but not limited to, non-volatile media and volatile media. Such instructions may be transmitted by one or more transmission media.
- FIG. 2 illustrates a first representative exemplary cancelation profile generator 130 and associated cancelation profile effector 135 , along with a programmable circuit 205 .
- cancelation profile generator 130 analyzes the noise energy profile and provides one or more parameters representing the energy of the noise to cancelation profile effector 135 .
- Effector 135 translates the one or more parameters into a register setting for programmable circuit 205 to adjust a gain or a transfer function of the programmable circuit such that an anti-noise signal generated by the programmable circuit largely cancels the ambient noise.
- an error amplifier in a feedback loop could be programmed for higher gain to cause a higher-magnitude anti-noise signal to be generated.
- cancelation profile effector 135 may translate the one or more parameters received from cancelation profile generator 130 into multiple parameters for programmable circuit 205 such that gain is adjusted.
- cancelation profile generator 130 may provide multiple values to cancelation profile effector 135 representing the energy of the noise in multiple frequency bands, and effector 135 translates the multiple values into one or more programmable circuit parameters for multiple programmable circuits 205 , such that gain may be adjusted separately for multiple frequency bands.
- cancelation profile effector 135 may program value(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively, cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205 .
- FIG. 3 illustrates an exemplary system model for a headphone with feedback to illustrate one representative active noise cancelation system.
- S( ⁇ ) represents an electrical input signal to a speaker in the ear cup of the headphone
- A( ⁇ ) represents desirable audio components in the input signal S( ⁇ )
- N( ⁇ ) represents ambient acoustic noise that passes through the earphone to the ear canal.
- O( ⁇ ) represents all of the acoustic sound reaching the ear canal.
- C( ⁇ ) will be discussed below.
- G( ⁇ ) represents the frequency response of an ear cup 305 of the headphone in which the speaker 310 receives input signal S( ⁇ ) and emits an acoustic signal.
- G 1 ( ⁇ ) represents the frequency response of speaker 310 .
- a microphone 315 provides an electrical signal as feedback representing a combination of the acoustic signal emitted by speaker 310 and noise N( ⁇ ).
- G 2 ( ⁇ ) represents the frequency response of microphone 315 .
- Km is the gain of an amplifier 330 for feedback microphone 315 .
- ⁇ ( ⁇ ) represents the frequency response of an equalizer 320 .
- Ka represents a gain in an audio amplifier 325 .
- the combination of ⁇ ( ⁇ ) and Ka is designed to have the same transfer function as the combination of G( ⁇ ) and Km.
- Ke is a gain of an error amplifier 335 and E( ⁇ ) is an error signal at the output of error amplifier 335 .
- Error signal E( ⁇ ) represents the acoustic signal received by microphone 315 with the desirable audio components A( ⁇ ) filtered out. Thus, in an ideal system, error signal E( ⁇ ) would be equal to zero.
- H( ⁇ ) represents the frequency response of a compensation filter 340 and C( ⁇ ) is a compensatory signal at the output of compensation filter 340 .
- H( ⁇ ) is designed to produce signal C( ⁇ ) such that speaker 310 in response to signal S( ⁇ ) emits an acoustic signal canceling noise N( ⁇ ) while allowing desirable audio to be delivered to the ear canal.
- the inputs to amplifier 335 are equal to each other and the error signal E( ⁇ ) at the output of amplifier 335 is zero.
- Signal O( ⁇ ) is the sum of the acoustic signal emitted by speaker 310 and the noise N( ⁇ ).
- Signal O( ⁇ ) may be calculated as a function of A( ⁇ ), ignoring noise N( ⁇ ) for the moment, as illustrated in Equation (1).
- Equation (2) the component of O(w) related to the desired audio signal A( ⁇ ).
- O ⁇ ( ⁇ ) A ⁇ ( ⁇ ) ⁇ G ⁇ ⁇ 1 ⁇ ( ⁇ ) ⁇ 1 + ( Ka ⁇ Ke ⁇ G ⁇ ⁇ ( ⁇ ) ⁇ H ⁇ ( ⁇ ) ) 1 + ( Km ⁇ Ke ⁇ G ⁇ ( ⁇ ) ⁇ H ⁇ ( ⁇ ) ) ( 2 )
- Equation (2) indicates that Ka x ⁇ ( ⁇ ) should be equal to Km x G( ⁇ ), as noted above.
- Signal O( ⁇ ) may also be calculated as an open-loop function of N( ⁇ ), ignoring audio signal A( ⁇ ), as illustrated in Equation (3).
- Signal O(w) may be calculated as a closed-loop function of N( ⁇ ) also, resulting in the relationship shown in Equation (4).
- Equation (4) indicates that for good noise attenuation at the ear canal, the open loop response of O(w) as indicated in Equation (3) should be large.
- a value for error amplifier 335 gain Ke may be calculated from the model of FIG. 3 .
- gain Ke may be increased to compensate for an increase in the amplitude of noise N( ⁇ ).
- Gain Ke may be calculated by cancelation profile effector 135 in response to a value provided by cancelation profile generator 130 to compensate for noise described in a noise profile from noise energy profiler 125 .
- Other parameters of components 320 , 325 , 330 , 335 , and 340 may also be changed to modify the response of the headphone.
- components 320 , 325 , 330 , 335 , and 340 are shown as separate functions, and it was described, for example, that gain Ke of component 335 may be adjusted based on noise N( ⁇ ) amplitude.
- components 320 , 325 , 330 , 335 , and 340 may be implemented as one programmable circuit with one or more programmable values, and the circuit as programmed implements a transfer function as indicated by a profile generated by cancelation profile generator 130 .
- FIG. 4 illustrates a second representative exemplary cancelation profile generator 130 and associated cancelation profile effector 135 , along with a programmable circuit 205 and a data store 405 .
- Data store 405 may include various kinds of mechanisms for storing, accessing, and retrieving various kinds of data, including a hierarchical database, a set of files in a file system, an application database in a proprietary format, a relational database management system (RDBMS), etc.
- RDBMS relational database management system
- data store 405 includes a set of energy profiles and a set of predetermined cancelation profiles, where each cancelation profile corresponds to an energy profile.
- Cancelation profile generator 130 compares a noise energy profile from noise energy profiler 125 to the set of energy profiles in data store 405 and selects a nearest match. For example, if most of the noise energy is in the frequency band 400-500 Hz, then cancelation profile generator 130 may select an energy profile from data store 405 in which most of the energy is in the frequency band 400-500 Hz. Once a nearest match energy profile is selected, the corresponding cancelation profile is provided to the cancelation profile effector 135 .
- cancelation profile effector 135 applies the cancelation profile to the system as appropriate for the system architecture.
- cancelation profile effector 135 may adjust parameters of compensation filter 340 by setting the parameters of one or more configurable circuits.
- cancelation profile effector 135 may adjust the parameters of the circuit according to the profile to effect a system transfer function for canceling noise.
- cancelation profile effector 135 may program parameter(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively, cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205 .
- FIG. 5 illustrates a third representative exemplary cancelation profile generator 130 including profile calculator 505 and an associated cancelation profile effector 135 , along with a programmable circuit 205 .
- cancelation profile generator 130 calculates, using profile calculator 505 , a cancelation profile that includes, for example, a desired cancelation signal for a compensation circuit or a desired transfer function for system 100 or a portion of system 100 .
- Cancelation profile effector 135 may then translate the cancelation profile into information to adjust configurable circuits 205 of the compensation circuit or the system.
- cancelation profile effector 135 may program parameter(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively, cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205 .
- FIG. 6 illustrates an exemplary process 600 that may be implemented in a system 100 .
- noise detector 120 identifies noise within system 100 .
- noise detector 120 may be a set of bandpass filters and one or more circuits that measure the energy in several different frequency bands.
- noise energy profiler 125 analyzes the noise identified in block 605 .
- noise may be analyzed to identify a frequency band with the highest average energy, or a set of frequency bands may be identified that each has an energy peak above a threshold.
- cancelation profile generator 130 determines a noise cancellation profile.
- a noise cancellation profile may be a desired transfer function for system 100 .
- a noise cancellation profile may be a desired transfer function for a programmable circuit such that a signal outputted by the programmable circuit is an anti-noise signal that cancels at least a portion of the noise identified at block 610 .
- cancelation profile effector 135 translates the noise cancellation profile determined at block 615 into actual values to apply to a programmable circuit.
- the noise cancellation profile may include cancelation in a certain frequency band and circuit values for a band pass filter may be calculated to achieve the desired cancelation in the desired band.
- the noise cancellation profile is applied to the programmable circuits by programming the values determined at block 620 into the programmable circuits according to the implemented programming protocol.
- process 600 ends.
- an electrical system that adapts to the environment by detecting undesirable signal components and configuring the system to compensate for the undesirable signal components.
- the electrical system is a headphone
- noise is detected, analyzed, and canceled.
Abstract
A system includes a noise detector configured to identify undesirable noise components in an acoustic signal and a noise energy profiler configured to analyze the identified undesirable noise components and generate a noise energy profile. In the system, a cancelation profile generator is configured to generate a noise cancelation profile based at least in part on information in the noise energy profile, and a cancelation profile effector is configured to translate the noise cancelation profile into values for a programmable circuit.
Description
- The present application claims benefit to U.S. provisional application 61/314,128 filed Mar. 15, 2010, the contents of which is incorporated herein in its entirety.
- Signals propagating through electrical systems may include desirable signal components and undesirable signal components. An undesirable component may be generated outside of an electrical system or generated by the electrical system itself. In an acoustic system, one such undesirable component is ambient acoustic noise.
- Circuits are often incorporated into an acoustic system to actively cancel certain types of expected ambient acoustic noise. However, the actual ambient acoustic noise may be quite different than the expected ambient acoustic noise.
- Thus, it is would be beneficial to have the ability to detect the actual ambient acoustic noise and adaptively configure the acoustic system to cancel the detected noise.
-
FIG. 1 illustrates an exemplary system for processing signals within an electrical system. -
FIG. 2 illustrates a first representative exemplary system for processing signals within an electrical system. -
FIG. 3 illustrates an exemplary system model for a headphone with feedback. -
FIG. 4 illustrates a second representative exemplary system for processing signals within an electrical system. -
FIG. 5 illustrates a third representative exemplary system for processing signals within an electrical system. -
FIG. 6 illustrates an exemplary process that may be implemented to identify ambient acoustic noise and adjust programmable circuits to cancel the noise at least in part. - An exemplary acoustic system is an acoustic headphone in which it may be beneficial to cancel acoustic noise present in the ambient environment.
- Some headphones are tuned at manufacture to cancel noise in certain frequency bands. For example, some headphones are tuned to cancel airplane engine noise that appears predominantly in the frequency band 200-300 Hertz (Hz). When such headphones are worn in an airplane the engine noise predominant in the ambient acoustic noise that penetrates the headphone ear cup is canceled within the headphone. When such headphones are worn elsewhere, the frequency band 200-300 Hz will still be canceled, but ambient acoustic noise at other frequencies may not be and the wearer of the headphone may hear ambient acoustic noise that penetrates the headphone ear cup.
- Some headphones include a mechanism by which the wearer of the headphone may switch between generally two or three different cancelation options. For example, the wearer may switch between airplane, car, and train noise cancelation options. The wearer of such a headphone does not have the ability to cancel other ambient noise such as the noise of jackhammers, the noise of crying babies, and the noise of squeaky machinery, to name just a few. The wearer of the headphone would only have the ability to try the different available cancelation options. The number of options provided may be limited by the size of the switching mechanism or by perceived complexity of use.
- A headphone as described below dynamically analyses the ambient acoustic noise and adaptively configures the headphone to cancel noise in at least a dominant frequency band of the noise. Analysis of noise may include determining the frequency band of the dominant potion of the noise. Analysis of noise may alternatively or additionally include profiling the energy of the noise by determining the energy of the noise at different frequencies or within different frequency bands.
- Cancelation may be performed passively or actively. In passive cancelation, only acoustical noise cancellation is used. In active cancelation, an anti-noise signal is generated and combined with the electrical signal applied to the speaker within the headphone, or an anti-noise acoustic signal is produced through a secondary speaker within the headphone. Anti-noise is a signal equal in magnitude and opposite in phase to the noise to be canceled. The use of anti-noise is sometimes referred to as active noise cancellation. Active noise cancellation may include some combination of feedback and feed forward signal processing.
- The term headphone as used herein may represent one headphone in a pair of headphones, one headphone in a headset with a single headphone, an earbud, an auditory aid, or any other acoustic device for transmitting audio signals from an input to a speaker. Further, the concepts described herein for headphones apply to other acoustic systems as well.
-
FIG. 1 illustrates anexemplary system 100 for adaptively canceling undesirable ambient noise. -
System 100 may include anoise detector 120, anoise energy profiler 125, acancelation profile generator 130, and acancelation profile effector 135. The various elements ofsystem 100 shown inFIG. 1 are presented as illustrative and not limiting.FIG. 1 may include more or fewer elements than shown as appropriate for a particular implementation. -
Noise detector 120 may be any of or a combination of hardware, software, and firmware that performs the function of identifying noise in a system. Information regarding the identified noise is provided to thenoise energy profiler 125. For example, information may include an analog or digital representation of the identified noise. -
Noise energy profiler 125 may be any of or a combination of hardware, software, and firmware that performs the function of profiling the energy in the noise.Noise energy profiler 125 uses the information fromnoise detector 120 to create a profile of the noise. For example, the noise energy profile may include average amplitude of the noise for multiple frequencies or frequency bands. As another example, the noise energy profile may identify a frequency band of the noise that contains the most energy.Noise energy profiler 125 may provide the profile tocancelation profile generator 130. -
Cancelation profile generator 130 may be any of or a combination of hardware, software, and firmware that performs the function of generating a profile for canceling noise. - In some implementations,
cancelation profile generator 130 generates a profile that represents a desired transfer function forsystem 100 inherently including noise cancelation. In other implementations,cancelation profile generator 130 generates a profile that represents a desired anti-noise signal. - In some implementations, a noise cancelation profile may be as simple as a single amplification factor. In other implementations, a noise cancelation profile may be a complex set of equations, or may include, for example, a matrix or other set of frequency, amplitude, and phase information describing an anti-noise signal or a desired frequency response. A profile may further be an indicator of a selection of a stored profile. Some exemplary representative implementations of
cancelation profile generator 130 and profiles are described in detail below.Cancelation profile generator 130 provides the generated profile to thecancelation profile effector 135. -
Cancelation profile effector 135 may be any of or a combination of hardware, software, and firmware that performs the function of applying the anti-noise profile within the electrical system. The implementation ofeffector 135 is dependent on the architecture ofsystem 100 and the form of the generated anti-noise profile. Thus, specific implementations ofeffector 135 are described in detail below with respect the associated exemplary implementations ofcancelation profile generator 130. -
Noise detector 120,noise energy profiler 125,cancelation profile generator 130, andcancelation profile effector 135 may be included in one or more computing devices. Examples of computing devices include, without limitation, a computer workstation, a server, a desktop, notebook, laptop, or handheld computer, a smart phone, a headphone, a device with an embedded processor, or some other known computing system or device. - Computing devices generally include computer-executable instructions. In general, a computing device receives instructions, e.g., from a memory, a computer-readable medium, etc., and executes these instructions, thereby performing one or more processes. Such instructions and other data may be stored and transmitted using a variety of known computer-readable media.
- A computer-readable medium (also referred to as a processor-readable medium) includes any non-transitory (e.g., tangible) medium that participates in providing data (e.g., instructions) that may be read by a computer (e.g., by a processor of a computer). Such a medium may take many forms, including, but not limited to, non-volatile media and volatile media. Such instructions may be transmitted by one or more transmission media.
-
FIG. 2 illustrates a first representative exemplarycancelation profile generator 130 and associatedcancelation profile effector 135, along with aprogrammable circuit 205. In this exemplary implementation,cancelation profile generator 130 analyzes the noise energy profile and provides one or more parameters representing the energy of the noise tocancelation profile effector 135.Effector 135 translates the one or more parameters into a register setting forprogrammable circuit 205 to adjust a gain or a transfer function of the programmable circuit such that an anti-noise signal generated by the programmable circuit largely cancels the ambient noise. For example, if a headphone was tuned at manufacture to cancel a certain expected magnitude of airplane noise but the actual airplane noise was significantly louder, an error amplifier in a feedback loop could be programmed for higher gain to cause a higher-magnitude anti-noise signal to be generated. - In other implementations,
cancelation profile effector 135 may translate the one or more parameters received fromcancelation profile generator 130 into multiple parameters forprogrammable circuit 205 such that gain is adjusted. In yet other implementations,cancelation profile generator 130 may provide multiple values tocancelation profile effector 135 representing the energy of the noise in multiple frequency bands, andeffector 135 translates the multiple values into one or more programmable circuit parameters for multipleprogrammable circuits 205, such that gain may be adjusted separately for multiple frequency bands. - In the example illustrated in
FIG. 2 ,cancelation profile effector 135 may program value(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively,cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205. -
FIG. 3 illustrates an exemplary system model for a headphone with feedback to illustrate one representative active noise cancelation system. In the model, S(ω) represents an electrical input signal to a speaker in the ear cup of the headphone, A(ω) represents desirable audio components in the input signal S(ω), and N(ω) represents ambient acoustic noise that passes through the earphone to the ear canal. O(ω) represents all of the acoustic sound reaching the ear canal. C(ω) will be discussed below. - G(ω) represents the frequency response of an
ear cup 305 of the headphone in which thespeaker 310 receives input signal S(ω) and emits an acoustic signal. G1(ω) represents the frequency response ofspeaker 310. Amicrophone 315 provides an electrical signal as feedback representing a combination of the acoustic signal emitted byspeaker 310 and noise N(ω). G2(ω) represents the frequency response ofmicrophone 315. Km is the gain of anamplifier 330 forfeedback microphone 315. - Ĝ(ω) represents the frequency response of an
equalizer 320. Ka represents a gain in anaudio amplifier 325. The combination of Ĝ(ω) and Ka is designed to have the same transfer function as the combination of G(ω) and Km. - Ke is a gain of an
error amplifier 335 and E(ω) is an error signal at the output oferror amplifier 335. Error signal E(ω) represents the acoustic signal received bymicrophone 315 with the desirable audio components A(ω) filtered out. Thus, in an ideal system, error signal E(ω) would be equal to zero. - H(ω) represents the frequency response of a
compensation filter 340 and C(ω) is a compensatory signal at the output ofcompensation filter 340. H(ω) is designed to produce signal C(ω) such thatspeaker 310 in response to signal S(ω) emits an acoustic signal canceling noise N(ω) while allowing desirable audio to be delivered to the ear canal. Thus, in the ideal case, with noise N(ω) completely canceled and Ĝ(ω) and Ka perfectly matched to balance G(ω) and Km, the inputs toamplifier 335 are equal to each other and the error signal E(ω) at the output ofamplifier 335 is zero. - Signal O(ω) is the sum of the acoustic signal emitted by
speaker 310 and the noise N(ω). Signal O(ω) may be calculated as a function of A(ω), ignoring noise N(ω) for the moment, as illustrated in Equation (1). -
O(ω)=(A(ω)+(A(ω)×Ka×Ĝ(ω)−O(ω)×Km×G(ω))×(Ke×H(ω)))×G1(ω) (1) - Solving Equation (1) for O(w) results in Equation (2), the component of O(w) related to the desired audio signal A(ω).
-
- Equation (2) indicates that Ka x Ĝ(ω) should be equal to Km x G(ω), as noted above.
- Signal O(ω) may also be calculated as an open-loop function of N(ω), ignoring audio signal A(ω), as illustrated in Equation (3).
-
O(ω)=N(ω)×Km×Ke×G(ω)×H(ω) (3) - Signal O(w) may be calculated as a closed-loop function of N(ω) also, resulting in the relationship shown in Equation (4).
-
- Equation (4) indicates that for good noise attenuation at the ear canal, the open loop response of O(w) as indicated in Equation (3) should be large.
- A value for
error amplifier 335 gain Ke may be calculated from the model ofFIG. 3 . For example, in Equation (4) it can be seen that gain Ke may be increased to compensate for an increase in the amplitude of noise N(ω). Gain Ke may be calculated bycancelation profile effector 135 in response to a value provided bycancelation profile generator 130 to compensate for noise described in a noise profile fromnoise energy profiler 125. Other parameters ofcomponents - In the example illustrated in
FIG. 3 thecomponents component 335 may be adjusted based on noise N(ω) amplitude. In other implementations,components cancelation profile generator 130. -
FIG. 4 illustrates a second representative exemplarycancelation profile generator 130 and associatedcancelation profile effector 135, along with aprogrammable circuit 205 and adata store 405.Data store 405 may include various kinds of mechanisms for storing, accessing, and retrieving various kinds of data, including a hierarchical database, a set of files in a file system, an application database in a proprietary format, a relational database management system (RDBMS), etc. - In the implementation illustrated in
FIG. 4 ,data store 405 includes a set of energy profiles and a set of predetermined cancelation profiles, where each cancelation profile corresponds to an energy profile.Cancelation profile generator 130 compares a noise energy profile fromnoise energy profiler 125 to the set of energy profiles indata store 405 and selects a nearest match. For example, if most of the noise energy is in the frequency band 400-500 Hz, then cancelationprofile generator 130 may select an energy profile fromdata store 405 in which most of the energy is in the frequency band 400-500 Hz. Once a nearest match energy profile is selected, the corresponding cancelation profile is provided to thecancelation profile effector 135. - Continuing with the second representative example,
cancelation profile effector 135 applies the cancelation profile to the system as appropriate for the system architecture. For example, in the headphone ofFIG. 3 ,cancelation profile effector 135 may adjust parameters ofcompensation filter 340 by setting the parameters of one or more configurable circuits. As another example, in a headphone in which all of thecomponents FIG. 3 are implemented together in a programmable circuit,cancelation profile effector 135 may adjust the parameters of the circuit according to the profile to effect a system transfer function for canceling noise. - In the example illustrated in
FIG. 4 ,cancelation profile effector 135 may program parameter(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively,cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205. -
FIG. 5 illustrates a third representative exemplarycancelation profile generator 130 includingprofile calculator 505 and an associatedcancelation profile effector 135, along with aprogrammable circuit 205. In this implementation,cancelation profile generator 130 calculates, usingprofile calculator 505, a cancelation profile that includes, for example, a desired cancelation signal for a compensation circuit or a desired transfer function forsystem 100 or a portion ofsystem 100.Cancelation profile effector 135 may then translate the cancelation profile into information to adjustconfigurable circuits 205 of the compensation circuit or the system. - In the example illustrated in
FIG. 5 ,cancelation profile effector 135 may program parameter(s) into programmable circuit(s) 205 using the implemented programming protocol. Alternatively,cancelation profile effector 135 may send a notice to another component (not shown) to perform the programming of programmable circuit(s) 205. - The exemplary implementations discussed above are not exhaustive, and many other implementations are possible.
-
FIG. 6 illustrates anexemplary process 600 that may be implemented in asystem 100. Atblock 605noise detector 120 identifies noise withinsystem 100. For example,noise detector 120 may be a set of bandpass filters and one or more circuits that measure the energy in several different frequency bands. - At
block 610noise energy profiler 125 analyzes the noise identified inblock 605. For example, noise may be analyzed to identify a frequency band with the highest average energy, or a set of frequency bands may be identified that each has an energy peak above a threshold. - At
block 615cancelation profile generator 130 determines a noise cancellation profile. In some implementations, a noise cancellation profile may be a desired transfer function forsystem 100. In other implementations, a noise cancellation profile may be a desired transfer function for a programmable circuit such that a signal outputted by the programmable circuit is an anti-noise signal that cancels at least a portion of the noise identified atblock 610. - At
block 620cancelation profile effector 135 translates the noise cancellation profile determined atblock 615 into actual values to apply to a programmable circuit. For example, the noise cancellation profile may include cancelation in a certain frequency band and circuit values for a band pass filter may be calculated to achieve the desired cancelation in the desired band. - At
block 625 the noise cancellation profile is applied to the programmable circuits by programming the values determined atblock 620 into the programmable circuits according to the implemented programming protocol. - Following
block 625,process 600 ends. - Thus, an electrical system is described that adapts to the environment by detecting undesirable signal components and configuring the system to compensate for the undesirable signal components. In the case in which the electrical system is a headphone, noise is detected, analyzed, and canceled.
- With regard to the processes, systems, methods, heuristics, etc. described herein, it should be understood that, although the steps of such processes, etc. have been described as occurring according to a certain ordered sequence, such processes could be practiced with the described steps performed in an order other than the order described herein. It further should be understood that certain steps could be performed simultaneously, that other steps could be added, or that certain steps described herein could be omitted. In other words, the descriptions of processes herein are provided for the purpose of illustrating certain embodiments, and should in no way be construed so as to limit the claimed invention.
- Accordingly, it is to be understood that the above description is intended to be illustrative and not restrictive. Many embodiments and applications other than the examples provided would be apparent upon reading the above description. The scope of the invention should be determined, not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. It is anticipated and intended that future developments will occur in the technologies discussed herein, and that the disclosed systems and methods will be incorporated into such future embodiments. In sum, it should be understood that the invention is capable of modification and variation.
- All terms used in the claims are intended to be given their broadest reasonable constructions and their ordinary meanings as understood by those knowledgeable in the technologies described herein unless an explicit indication to the contrary in made herein. In particular, use of the singular articles such as “a,” “the,” “said,” etc. should be read to recite one or more of the indicated elements unless a claim recites an explicit limitation to the contrary.
Claims (24)
1. An apparatus, comprising:
a noise detector configured to identify undesirable noise components in an acoustic signal;
a noise energy profiler configured to analyze the identified undesirable noise components and generate a noise energy profile;
a cancelation profile generator configured to generate a noise cancelation profile based at least in part on information in the noise energy profile; and
a cancelation profile effector configured to translate the noise cancelation profile into values for a programmable circuit.
2. The apparatus of claim 1 , the noise cancelation profile representing a desired gain for a feedback component of the apparatus, and the programmable circuit including at least one programmable element for adjusting the desired gain.
3. The apparatus of claim 1 , further comprising a data store including a group of predefined energy profiles, the cancelation profile generator selecting a predefined energy profile from the group of predefined energy profiles based at least in part on the noise energy profile generated by the noise energy profiler.
4. The apparatus of claim 3 , the data store further including a group of predefined cancelation profiles wherein each predefined energy profile corresponds to at least one cancelation profile, the cancelation profile generator further selecting a predefined cancelation profile corresponding to the selected predefined energy profile.
5. The apparatus of claim 4 , the predefined cancelation profile representing a desired gain for a feedback component of the apparatus, and the programmable circuit including at least one programmable element for adjusting the desired gain.
6. The apparatus of claim 4 , the predefined cancelation profile representing a desired frequency response for a signal path including the programmable circuit.
7. The apparatus of claim 4 , the predefined cancelation profile representing a desired frequency response of an anti-noise signal generated by the programmable circuit.
8. The apparatus of claim 1 , the cancelation profile generator including a profile calculator configured to calculate a cancelation profile.
9. The apparatus of claim 8 , the calculated cancelation profile representing a desired frequency response for a signal path including the programmable circuit.
10. The apparatus of claim 8 , the cancelation profile being substantially similar in amplitude and substantially opposite in phase to the noise energy profile across a predefined frequency spectrum, the calculated cancelation profile representing a desired frequency response of an anti-noise signal generated by the programmable circuit.
11. The apparatus of claim 1 , included in a headphone.
12. The apparatus of claim 1 , included in an auditory amplification device.
13. A method, comprising:
identifying undesirable noise components in an acoustic signal;
analyzing the identified undesirable noise components;
generating a noise energy profile;
generating a noise cancelation profile based at least in part on information in the noise energy profile; and
translating the noise cancelation profile into values for a programmable circuit.
14. The method of claim 13 , the noise cancelation profile representing a desired gain for a feedback component of an apparatus, and the programmable circuit including at least one programmable element for adjusting the desired gain.
15. The method of claim 13 , further comprising:
selecting a predefined energy profile from a group of predefined energy profiles in a data store based at least in part on the noise energy profile.
16. The method of claim 15 , further comprising:
selecting a predefined cancelation profile from the data store, the predefined cancelation profile corresponding to the selected predefined energy profile.
17. The method of claim 16 , the predefined cancelation profile representing a desired gain for a feedback component of an apparatus, and the programmable circuit including at least one programmable element for adjusting the desired gain.
18. The method of claim 16 , the predefined cancelation profile representing a desired frequency response for a signal path including the programmable circuit.
19. The method of claim 4 , the predefined cancelation profile representing a desired frequency response of an anti-noise signal generated by the programmable circuit.
20. The method of claim 13 , the cancelation profile generator including a profile calculator configured to calculate a cancelation profile.
21. The method of claim 20 , the calculated cancelation profile representing a desired frequency response for a signal path including the programmable circuit.
22. The method of claim 20 , the cancelation profile being substantially similar in amplitude and substantially opposite in phase to the noise energy profile across a predefined frequency spectrum, the calculated cancelation profile representing a desired frequency response of an anti-noise signal generated by the programmable circuit.
23. The method of claim 13 , included in a headphone.
24. The method of claim 13 , included in an auditory amplification device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/046,358 US20110222700A1 (en) | 2010-03-15 | 2011-03-11 | Adaptive active noise cancellation system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31412810P | 2010-03-15 | 2010-03-15 | |
US13/046,358 US20110222700A1 (en) | 2010-03-15 | 2011-03-11 | Adaptive active noise cancellation system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110222700A1 true US20110222700A1 (en) | 2011-09-15 |
Family
ID=44559981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/046,358 Abandoned US20110222700A1 (en) | 2010-03-15 | 2011-03-11 | Adaptive active noise cancellation system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110222700A1 (en) |
JP (1) | JP2013523015A (en) |
CN (1) | CN103026405A (en) |
WO (1) | WO2011115837A2 (en) |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090296945A1 (en) * | 2005-08-25 | 2009-12-03 | Fawzi Attia | Method and device for evaluating the annoyance of squeaking noises |
US20120316872A1 (en) * | 2011-06-07 | 2012-12-13 | Analog Devices, Inc. | Adaptive active noise canceling for handset |
US20140363009A1 (en) * | 2013-05-08 | 2014-12-11 | Max Sound Corporation | Active noise cancellation method for motorcycles |
US20140369515A1 (en) * | 2013-03-12 | 2014-12-18 | Max Sound Corporation | Environmental noise reduction |
US20150003621A1 (en) * | 2013-02-15 | 2015-01-01 | Max Sound Corporation | Personal noise reduction method for enclosed cabins |
US20150003626A1 (en) * | 2013-02-25 | 2015-01-01 | Max Sound Corporation | Active noise cancellation method for automobiles |
US20150358728A1 (en) * | 2013-02-25 | 2015-12-10 | Max Sound Corporation | Active noise cancellation method for aircraft |
US9524731B2 (en) | 2014-04-08 | 2016-12-20 | Doppler Labs, Inc. | Active acoustic filter with location-based filter characteristics |
US9557960B2 (en) | 2014-04-08 | 2017-01-31 | Doppler Labs, Inc. | Active acoustic filter with automatic selection of filter parameters based on ambient sound |
US9560437B2 (en) | 2014-04-08 | 2017-01-31 | Doppler Labs, Inc. | Time heuristic audio control |
US9565491B2 (en) * | 2015-06-01 | 2017-02-07 | Doppler Labs, Inc. | Real-time audio processing of ambient sound |
US9584899B1 (en) | 2015-11-25 | 2017-02-28 | Doppler Labs, Inc. | Sharing of custom audio processing parameters |
US9648436B2 (en) | 2014-04-08 | 2017-05-09 | Doppler Labs, Inc. | Augmented reality sound system |
US20170156017A1 (en) * | 2015-05-22 | 2017-06-01 | Microsoft Technology Licensing, Llc | Systems and methods for audio creation and delivery |
US9678709B1 (en) | 2015-11-25 | 2017-06-13 | Doppler Labs, Inc. | Processing sound using collective feedforward |
US9703524B2 (en) | 2015-11-25 | 2017-07-11 | Doppler Labs, Inc. | Privacy protection in collective feedforward |
WO2017123547A1 (en) * | 2016-01-12 | 2017-07-20 | Bose Corporation | Systems and methods of active noise reduction in headphones |
US9736264B2 (en) | 2014-04-08 | 2017-08-15 | Doppler Labs, Inc. | Personal audio system using processing parameters learned from user feedback |
US9825598B2 (en) | 2014-04-08 | 2017-11-21 | Doppler Labs, Inc. | Real-time combination of ambient audio and a secondary audio source |
US10553195B2 (en) | 2017-03-30 | 2020-02-04 | Bose Corporation | Dynamic compensation in active noise reduction devices |
US10580398B2 (en) | 2017-03-30 | 2020-03-03 | Bose Corporation | Parallel compensation in active noise reduction devices |
US10614790B2 (en) * | 2017-03-30 | 2020-04-07 | Bose Corporation | Automatic gain control in an active noise reduction (ANR) signal flow path |
US10853025B2 (en) | 2015-11-25 | 2020-12-01 | Dolby Laboratories Licensing Corporation | Sharing of custom audio processing parameters |
US11145320B2 (en) | 2015-11-25 | 2021-10-12 | Dolby Laboratories Licensing Corporation | Privacy protection in collective feedforward |
US20210335336A1 (en) * | 2020-04-24 | 2021-10-28 | Bose Corporation | Managing Characteristics of Active Noise Reduction |
US11556787B2 (en) | 2020-05-27 | 2023-01-17 | International Business Machines Corporation | AI-assisted detection and prevention of unwanted noise |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105741828B (en) * | 2016-01-29 | 2019-07-09 | 南京大学 | Detachable active noise control system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5699437A (en) * | 1995-08-29 | 1997-12-16 | United Technologies Corporation | Active noise control system using phased-array sensors |
US20080112569A1 (en) * | 2006-11-14 | 2008-05-15 | Sony Corporation | Noise reducing device, noise reducing method, noise reducing program, and noise reducing audio outputting device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1577879B1 (en) * | 2004-03-17 | 2008-07-23 | Harman Becker Automotive Systems GmbH | Active noise tuning system, use of such a noise tuning system and active noise tuning method |
GB2434708B (en) * | 2006-01-26 | 2008-02-27 | Sonaptic Ltd | Ambient noise reduction arrangements |
JP5401759B2 (en) * | 2007-01-16 | 2014-01-29 | ソニー株式会社 | Audio output device, audio output method, audio output system, and audio output processing program |
-
2011
- 2011-03-11 JP JP2013500106A patent/JP2013523015A/en not_active Withdrawn
- 2011-03-11 CN CN2011800112302A patent/CN103026405A/en active Pending
- 2011-03-11 WO PCT/US2011/028121 patent/WO2011115837A2/en active Application Filing
- 2011-03-11 US US13/046,358 patent/US20110222700A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5699437A (en) * | 1995-08-29 | 1997-12-16 | United Technologies Corporation | Active noise control system using phased-array sensors |
US20080112569A1 (en) * | 2006-11-14 | 2008-05-15 | Sony Corporation | Noise reducing device, noise reducing method, noise reducing program, and noise reducing audio outputting device |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090296945A1 (en) * | 2005-08-25 | 2009-12-03 | Fawzi Attia | Method and device for evaluating the annoyance of squeaking noises |
US20120316872A1 (en) * | 2011-06-07 | 2012-12-13 | Analog Devices, Inc. | Adaptive active noise canceling for handset |
US8909524B2 (en) * | 2011-06-07 | 2014-12-09 | Analog Devices, Inc. | Adaptive active noise canceling for handset |
US20150003621A1 (en) * | 2013-02-15 | 2015-01-01 | Max Sound Corporation | Personal noise reduction method for enclosed cabins |
US20150003626A1 (en) * | 2013-02-25 | 2015-01-01 | Max Sound Corporation | Active noise cancellation method for automobiles |
US20150358728A1 (en) * | 2013-02-25 | 2015-12-10 | Max Sound Corporation | Active noise cancellation method for aircraft |
US20140369515A1 (en) * | 2013-03-12 | 2014-12-18 | Max Sound Corporation | Environmental noise reduction |
US20140363009A1 (en) * | 2013-05-08 | 2014-12-11 | Max Sound Corporation | Active noise cancellation method for motorcycles |
US9736264B2 (en) | 2014-04-08 | 2017-08-15 | Doppler Labs, Inc. | Personal audio system using processing parameters learned from user feedback |
US9524731B2 (en) | 2014-04-08 | 2016-12-20 | Doppler Labs, Inc. | Active acoustic filter with location-based filter characteristics |
US9560437B2 (en) | 2014-04-08 | 2017-01-31 | Doppler Labs, Inc. | Time heuristic audio control |
US9648436B2 (en) | 2014-04-08 | 2017-05-09 | Doppler Labs, Inc. | Augmented reality sound system |
US9557960B2 (en) | 2014-04-08 | 2017-01-31 | Doppler Labs, Inc. | Active acoustic filter with automatic selection of filter parameters based on ambient sound |
US9825598B2 (en) | 2014-04-08 | 2017-11-21 | Doppler Labs, Inc. | Real-time combination of ambient audio and a secondary audio source |
US10129684B2 (en) * | 2015-05-22 | 2018-11-13 | Microsoft Technology Licensing, Llc | Systems and methods for audio creation and delivery |
US20170156017A1 (en) * | 2015-05-22 | 2017-06-01 | Microsoft Technology Licensing, Llc | Systems and methods for audio creation and delivery |
US9565491B2 (en) * | 2015-06-01 | 2017-02-07 | Doppler Labs, Inc. | Real-time audio processing of ambient sound |
US9678709B1 (en) | 2015-11-25 | 2017-06-13 | Doppler Labs, Inc. | Processing sound using collective feedforward |
US9584899B1 (en) | 2015-11-25 | 2017-02-28 | Doppler Labs, Inc. | Sharing of custom audio processing parameters |
US11145320B2 (en) | 2015-11-25 | 2021-10-12 | Dolby Laboratories Licensing Corporation | Privacy protection in collective feedforward |
US9769553B2 (en) | 2015-11-25 | 2017-09-19 | Doppler Labs, Inc. | Adaptive filtering with machine learning |
US9703524B2 (en) | 2015-11-25 | 2017-07-11 | Doppler Labs, Inc. | Privacy protection in collective feedforward |
US10853025B2 (en) | 2015-11-25 | 2020-12-01 | Dolby Laboratories Licensing Corporation | Sharing of custom audio processing parameters |
US10275210B2 (en) | 2015-11-25 | 2019-04-30 | Dolby Laboratories Licensing Corporation | Privacy protection in collective feedforward |
US20170337917A1 (en) * | 2016-01-12 | 2017-11-23 | Bose Corporation | Systems and methods of active noise reduction in headphones |
CN108701449A (en) * | 2016-01-12 | 2018-10-23 | 伯斯有限公司 | The system and method for active noise reduction in earphone |
US10614791B2 (en) * | 2016-01-12 | 2020-04-07 | Bose Corporation | Systems and methods of active noise reduction in headphones |
WO2017123547A1 (en) * | 2016-01-12 | 2017-07-20 | Bose Corporation | Systems and methods of active noise reduction in headphones |
US9747887B2 (en) | 2016-01-12 | 2017-08-29 | Bose Corporation | Systems and methods of active noise reduction in headphones |
US10553195B2 (en) | 2017-03-30 | 2020-02-04 | Bose Corporation | Dynamic compensation in active noise reduction devices |
US10580398B2 (en) | 2017-03-30 | 2020-03-03 | Bose Corporation | Parallel compensation in active noise reduction devices |
US10614790B2 (en) * | 2017-03-30 | 2020-04-07 | Bose Corporation | Automatic gain control in an active noise reduction (ANR) signal flow path |
US11636841B2 (en) | 2017-03-30 | 2023-04-25 | Bose Corporation | Automatic gain control in an active noise reduction (ANR) signal flow path |
US20210335336A1 (en) * | 2020-04-24 | 2021-10-28 | Bose Corporation | Managing Characteristics of Active Noise Reduction |
US11600256B2 (en) * | 2020-04-24 | 2023-03-07 | Bose Corporation | Managing characteristics of active noise reduction |
US11556787B2 (en) | 2020-05-27 | 2023-01-17 | International Business Machines Corporation | AI-assisted detection and prevention of unwanted noise |
Also Published As
Publication number | Publication date |
---|---|
CN103026405A (en) | 2013-04-03 |
JP2013523015A (en) | 2013-06-13 |
WO2011115837A3 (en) | 2012-01-19 |
WO2011115837A2 (en) | 2011-09-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20110222700A1 (en) | Adaptive active noise cancellation system | |
US10354640B2 (en) | Parallel active noise reduction (ANR) and hear-through signal flow paths in acoustic devices | |
US8107637B2 (en) | Signal processing device and signal processing method | |
US20160300562A1 (en) | Adaptive feedback control for earbuds, headphones, and handsets | |
EP3127348B1 (en) | Headphone on-head detection using differential signal measurement | |
MX2014011556A (en) | Apparatus and method for improving the perceived quality of sound reproduction by combining active noise cancellation and perceptual noise compensation. | |
US11862140B2 (en) | Audio system and signal processing method for an ear mountable playback device | |
CN111052226A (en) | Noise canceling system, noise canceling headphone, and noise canceling method | |
US11258908B2 (en) | Spectral blending with interior microphone | |
US11062687B2 (en) | Compensation for microphone roll-off variation in acoustic devices | |
US11651759B2 (en) | Gain adjustment in ANR system with multiple feedforward microphones | |
US9980043B2 (en) | Method and device for adjusting balance between frequency components of an audio signal | |
CN108574898B (en) | Active noise reduction system optimization method and system | |
CN109313889A (en) | Alleviate the unsteady phenomena in active noise control system | |
EP3799031A1 (en) | Audio system and signal processing method for an ear mountable playback device | |
US11640817B2 (en) | Instability mitigation in an active noise reduction (ANR) system having a hear-through mode | |
US20220076656A1 (en) | Robust open-ear ambient sound control with leakage detection | |
SE2150611A1 (en) | Voice optimization in noisy environments | |
KR101573577B1 (en) | Apparatus and method for controlling sound output | |
CN114450745A (en) | Audio system and signal processing method for ear-wearing type playing device | |
KR101902122B1 (en) | Active noise reduction method and system for improving audibility on residual noise | |
CN111133505B (en) | Parallel Active Noise Reduction (ANR) and traversing listening signal flow paths in acoustic devices | |
US20240071350A1 (en) | A method for automatically designing a feedforward filter | |
US11763791B2 (en) | Noise amplification control in adaptive noise cancelling systems | |
US20230154449A1 (en) | Method, device, headphones and computer program for actively suppressing interfering noise |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NATIONAL ACQUISITION SUB., INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BHANDARI, SANJAY;REEL/FRAME:025941/0489 Effective date: 20110309 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |